#include <iostream>
#include<cstdio>
#include<vector>
#define H 100003
using namespace std;
vector<int> h[H];
int n,x,y,k;
int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    cin>>n;
    for(;n;n--)
    {
        cin>>x>>y;
        k=y%H;
        vector<int>::iterator it;
        for(it=h[k].begin();it!=h[k].end();it++)
            if(*it==y)
                break;
        if(x==1)
        {
            if(it==h[k].end())
                h[k].push_back(y);
        }
        else
        if(x==2)
        {
            if(it!=h[k].end())
            {
                *it=h[k].back();
                h[k].pop_back();
            }
        }
        else
            if(it==h[k].end())
                cout<<"0\n";
                else
                cout<<"1\n";
    }
    return 0;
}